Mstislav Keldysh
Soviet mathematician
Mstislav Vsevolodovich Keldysh was a Soviet mathematician who worked as an engineer in the Soviet space program. Wikipedia
Born: February 10, 1911, Riga, Latvia
Died: June 24, 1978 (age 67 years), Moscow, Russia
Nationality: Russian and Soviet
Siblings: Lyudmila Keldysh and Ûrij Vsevolodovič Keldyš